Upload image file from device and save it to folder on server using WCF Service

I have to get image of a user from his device and save it on to a server folder using WCF.

How to do it. I hvae been using the below mentioned code. But its not morning no error no warning and neither success.

 [OperationContract]
    [WebInvoke(Method = "POST", UriTemplate = "UpdateUserImage",
        RequestFormat = WebMessageFormat.Json,
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Wrapped)]
        String UpdateUserImage(Stream fileContents);



 public string UpdateUserImage(Stream fileContents)
        {
            string result;

string FilePath = ConfigurationManager.AppSettings["TemplatePath"].ToString();

            System.Drawing.Image img = System.Drawing.Image.FromStream(fileContents);

            img.Save(FilePath + "\\mypics.Jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);

            result = "Image ";
            return result;
}

Can i get one good working example as all the one's i searched in open forums didnt get any lead.

I am using Net framework 3.5